ML20073E222
| ML20073E222 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 09/23/1994 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20073E220 | List: |
| References | |
| NUDOCS 9409280305 | |
| Download: ML20073E222 (7) | |
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UNITED STATES j
NUCLEAR REGULATORY COMMISSION WASHINGTON. D.C. 20555 0001
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NOS.152 AND 156 TO FACILITY OPERATING LICENSE NOS. DPR-24 AND DPR-27 WISCONSIN ELECTRIC POWER COMPANY P0 INT BEACH NUCLEAR PLANT. UNIT NOS. 1 AND 2 DOCKET N05, 50-266 AND 50-301
1.0 BACKGROUND
By letter dated May 26, 1994, as supplemented on July 11, 1994, and August 1, 1994, Wisconsin Electric Power Company (WEPCo), the licensee, proposed to modify the Point Beach Nuclear Plant (PBNP), Units 1 and 2, Technical Specifications (TS) Sections 15.3.0, " Limiting Conditions for Operation,"
15.3.7, " Auxiliary Electrical Systems," 15.3.14, " Fire Protection System," and 15.4.6, " Emergency Power System Periodic Tests." The changes are related to the addition of two emergency diesel generators (EDGs).
2.0 EVALUATION WEPCo is adding two EDGs to Point Beach Nuclear Plant, Units 1 and 2, and reconfiguring portions of the 4160-Volt emergency electrical po w system.
The first connection of the output of one of the additional emergency diesel generators into the existing electrical system is expected to take place during th fall,1994 Unit 2 refueling outage, which is presently scheduled to start on deptember 24, 1994.
The proposed amendment to the TS establishes the requirements for the electrical systems at Point Beach such that the TS will provide the appropriate guidance for all interim electrical configurations and the final configuration.
2.1 IS_15.3.0 General Considerations. Limitino Conditions for Operation.
(Bases Oniv)
The Bases section of TS 15.3.0 is changed to include the appropriate references to TS 15.3.7 and the nomenclature used for the onsite emergency AC power source is changed from " emergency diesel generator" or " emergency power source" to " standby emergency power supply." This nomenclature provides a consistent method to specify the Technical Specification requirements.
Based on the staff's concerns regarding their proposed common cause failure evaluation, PBNP modified the TS Bases to include the following:
9409280305 940923 PDR ADOCK 05000266 P
. The LCOs for the standby emergency power supplies require the redundant standby emergency power supplies to be started within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of entry into these LCOs.
If the standby emergency power supply LC0 is exited within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, then starting of the redundant standby emergency power supplies is not required.
if the LC0 was entered due to a standby emergency power supply failure and the LC0 was exited within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, then an evaluation must t'e completed as soon as possible within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of entr.)
into the LC0 to show that the redundant standby power supplies are not susceptible to that failure by common cause or the reduncant standby emergency power supplies must be started to prove that failure by common cause does not exist within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of entry into the LCO.
This provides clarification regarding the requirements for a common cause failure evaluation. Therefore, the staff finds the changes acceptable.
2.2 TS 15.3.7 Auxiliary Electrical Systems 2.2.1 TS 15.3.7.A.l.d. e. and f The Limiting Conditions for Operation for the 4160-Volt (A05 and A06) and 480-Volt (803 and B04) safeguards buses and the emergency diesel generators (standby emergency power supplies) are changed to specify the requirements for making one or both reactors critical by combining parts of the requirements of TS 15.3.7.A.l.d and e and placing them into separate specifications (TS 15.3.7 A. l.j, k, and 1). Also, the fuel oil storage requirement in TS 15.3.7.A.I.f is being clarified to require 11,000 gallon of fuel oil in each tank that is being relied upon to supply an operable emergency diesel generator (s).
This change is an improvement over the existing Technical Specification requirements because it provides the proper Technical Specification requirements for the electrical system when one or both reactors are made critical.
Therefore, tre change is acceptable.
TS 15.3.7. A.l.j, k, and 1 are added to replace the requirements previously contained in TS 15.3.7.A.I.d, e and f.
These additions are as follows:
j.
For both units to be made critical, the normal power supply and a standby emergency power supply to all the 4160/480 Volt safeguards buses shall be operable and the buses are energized from their normal supply.
k.
For Unit I to be made critical, the normal power supply and a standby emergency power supply to the 4160/480 Volt safeguards buses Unit 1 A05/B03, Unit 1 A06/B04, and Unit 2 A06/B04 shall be operable and the buses are energized from their normal supply.
1.
For Unit 2 to be made critical, the normal power supply and a standby emergency power supply to the 4160/480 Volt safeguards buses Unit 2 A05/B03, Unit 2 A06/B04, and Unit 1 A05/B03 shall be operable and the buses are energized from their normal supply.
t These changes combine the requirements for normal and standby emergency power and places these requirements in separate specifications for making Unit 1, Unit 2, and both reactors critical. The new requirements remain consistent with the previous requirements while incorporating the addition of two diesel generators. Therefore, the staff finds the changes acceptable.
Also, the 11,000-gallon fuel oil storage requirement is being clarified, and the wording of TS 15.3.7.A.I.f is revised to read as follows:
l f.
A fuel supply of 11,000 gallons is available in each tank which is being relied upon to supply any operable emergency diesel generator (s).
The change is administrative in nature and provides clarification.
Therefore, the staff finds the change acceptable.
TS 15.3.7.A.2 which previously allowed one reactor to be critical without offsite power or with only one transmission line in service is removed l
entirely.
Since the construction'of Point Beach, additional power generation facilities have been added to the PBNP system, such as additional combustion turbines.
Current offsite power system recovery would be. initiated by using sources of power other than Point Beach, so this specification is no longer considered necessary.
Therefore, the staff finds the change acceptable.
2.2.2 TS 15.3.7.B.1.d and a The requirements of TS 15.3.7.B.1.d and g are being placed into the new TS 15.3.7.B.1.f, g, and h.
The new TS 15.3.7.B.l.f, g, and h incorporate the requirements of TS 15.3.7.B.1.d by specifying the requirements for normal power to be operable t
for each unit with consideration of the shared equipment that is powered from buses on the opposite unit.
The new TS 15.3.7.B.1.f, g, and h incorporate the requirements of TS 15.3.7.B.I.g by specifying the requirements for standby emergency power to be operable for each unit with consideration of the shared equipment that is powered from buses on the opposite unit, the requirements for redundant engineered safety features to be operable, and the requirements for redundant emergency power supplies to be tested within 24-hours of entry into any of these LCOs and every 72-hours thereafter.
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. The associated 480-Volt bus designations are being included to mai'itain consistency with the new TS 15.3.7.A.I.j, k, and 1.
This also mates these
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Specifications more complete and accurate for the AC power distribution system requirements.
The requirement of TS 15.3.7.B.I.g which states, "This LC0 shall not be allowed in conjunction with e. or f. above" is no longer necessary. The cross-tie TS 15.3.7.B.I.e (being redesignated TS 15.3.7.B.I.d) for an 8-hour LCO is being changed to include the statement, "The required redundant shared engineered safety features for the other unit are operable." This statement alone provides the appropriate guidance for all the required redundant shared equipment, including the emergency diesel generators.
This change also applies to the cross-tie specification for the defueled condition, TS 15.3.7.B.I.f being redesignated 15.3.7.B.l.e.
Therefore, the statement, "This LC0 shall not be allowed in conjunction with e. or f. above" is no longer necessary.
The new TS 15.3.7.B.I.f, g, and h will be as follows:
f.
The normal power supply or standby emergency power supply to Unit 1 A05/B03 or Unit 2 A06/B04 may be out of service for a period not exceeding 7 days provided the required redundant engineered safety features are operable and the required redundant standby emergency power supplies are started within 24 hourt before or after entry into this LC0 and every 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> thereafter.
If the normal power supply is out of service, an operable emergency diesel generator is supplying the affected 4160/480 Volt buses. After 7 days, both units will be placed in hot shutdown within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and cold shutdown within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.
g.
The normal power supply or standby emergency power supply to Unit 1 A06/B04 or Unit 2 A05/B03 or both may be out of service for a period not exceeding 7 days provided the required redundant engineered safety features are operable and the required redundant standby emergency power supplies are started within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> before or after entry into this LC0 and every 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> thereafter.
If the normal power supply is out of service, an operable emergency diesel generator is supplying the affected 4160/480 Volt buses.
After 7 days, the affected unit or units will be placed in hot shutdown within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and cold shutdown within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.
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The normal power supply or standby emergency power supply to Unit 1 A05/B03 and Unit 2 A05/B03, or Unit 1 A06/B04 and Unit 2 A06/B04 may be out of service for a period not exceeding 7 days provided the required redundant engineered safety features are operable and the required redundant i
standby emergency power supplies are started within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> before or after entry into this LC0 and every 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> thereafter.
If the normal power supply is out of service, an operable emergency diesel gerierator is supplying the affected 4160/480 Volt buses. After 7 days, both units will be placed in hot shutdown within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and cold shutdown within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.
The new requirements described above in the safety evaluation section 2.2.2 remain consistent with the previous requirements while incorporating the addition of two diesel generators.
Therefore, the staff finds the changes acceptable.
2.2.3 IS 15.3.7.B.I.e and f TS 15.3.7.B.I.e is changed to TS 15.3.7.B.I.d, the applicability for defueled condition is added, and the reference is changed from TS 15.3.7.B.1.f to TS 15.3.7.B.I.e.
As described previously, TS 15.3.7.B.l.d is being deleted.
Therefore, the TS 15.3.7.B.l.e is being redesignated TS 15.3.7.B.I.d.
The applicability to the defueled condition is being added because this specification was always applicable to the defueled condition by reference to TS 15.3.7.8.1.f.
Therefore, the inclusion of the applicability for the defueled condition is a clarification.
TS 15.3.7.B.I.f is changed to TS 15.3.7.B.1.e.
As described previously, TS 15.3.7.B.l.d is deleted.
Therefore, the TS 15.3.7.B.I.f is being redesignated TS 15.3.7.B.I.e.
Both of these TS are changed to ir. corporate the requirement from TS 15.3.7.B.I.g which states, "This LC0 shall not be allowed in conjunction with e. or f. above." This requirement is being incorporated into the proposed TS 15.3.7.B.I.d by adding the statement, "The required redundant decay heat removal for the shutdown unit and the required redundant shared engineered safety features for the other unit are operable." This requirement is being incorporated into the proposed TS 15.3.7.B.I.e by adding the statement, "The required redundant shared engineered safety features for the other unit are operable." These statements provide the appropriate guidance for all the required redundant equipment, including the emergency diesel generators.
The changes described above in the safety evaluation section 2.2.3 are purely administrative in nature and clarify the TS.
Therefore, the changes are i
acceptable.
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4 2.2.4 TS 15.3.7.B.J.k The statement, "If any safeguards bus is deenergized, the applicable LCOs will be entered for the affected equipment" is added to provide appropriate guidance for the condition of a deenergized safeguards bus. This change corrects a contradiction in the Technical Specifications.
The current Technical Specifications do not provide guidance for the loss of both the normal and standby emergency power supplies.
This condition would invoke the General Consideration TS 15.3.0. A which states, "In the event an LCO cannot be satisfied because of equipment failures or limitations beyond those specified in the permissible conditions of the LCO, the affected unit, which is critical, shall be placed in hot shutdown conditiens within three hours of discovery of the situation."
It is more appropriate to enter the applicable Limiting Conditions for Operation for the equipment that is rendered inoperable by the loss of power to the safeguards bus or buses. The proposed TS 15.3.7.B.l.k will provide this guidance.
This change eliminated a contradiction in the TS and is
- consistent with current staff position.
Therefore, the change is acceptable.
2.3 TS 15.4.6 Emeraency Power System periodic Tests 2.3.1 TS 15.4.6.A.4 The frequency for inspection of the emergency diesel generators is changed.
This specification currently states that the inspection be performed "at least
- annually, following the manufacturer's recommendations for this class of standby service." This is being changed to remove the "at least annually" 4
clause.
Operating experience and manufacturer's recommendations currently indicate that annual maintenance inspections are not necessary.
This change allows the manufacturer's recommendations, as interpreted by the EMD owners' group, to be followed for all the EDGs at PBNP.
The change in the testing interval is consistent with staff position.
-Therefore, the change is acceptable.
2.3.2 JS 15.4.6.A.6 i
This specification is changed to include the appropriate designations for the.
fuel oil that is required to be sampled.
The sampling requirement is basically remaining the same, except that the fuel oil tanks that are being installed as part of the new emergency diesel generator project are not called " emergency fuel oil tanks." These tanks are called " fuel oil storage tanks." Therefore, the terminology for identification of the tanks that must be sampled is being changed to " fuel oil storage tanks which supply the emergency diesel generators."
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The change is purely administrative in nature.
Therefore, the staff finds the change acceptable.
2.4 Table 15.3.14-1 Safe Shutdown Area Fire Protection Table 15.3.14-1 is modified by the addition of the new diesel generator rooms, the associated vital switchgear rooms, and the fuel oil day tank rooms.
Automatic fire detection has been provided for all areas of the diesel generator building.
The rooms all have manual suppression through the fire hose station located in the mechanical equipment room.
In addition, the diesel generator rooms and the fuel oil day tank rooms have water sprinkler systems for automatic suppression.
The fire protection systems in this table are consistent with current staff position, and therefore, the changes (additions) are acceptable.
3.0 STATE CONSULTATION
In accordance with the Commission's regulations, the Wisconsin State official was notified of the proposed issua. ice of the amendments.
The State official had no comments.
4.0 ENVIRONMENTAL CONSIDERATION
These amendments change a requirement with respect to the installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 or change a surveillance requirement.
The staff has determined that the amendments involve no significant increase in the amounts, and no significant change in the types, of any effluent that may be released offsite, and that there is no significant increase in individua! or cumu?ative occupa-tional radiation exposure.
The Commission has previously published a proposed finding that these amendments involve no significant hazards consid-eration and there has been no public comment on such finding (59 FR 37092).
Accordingly, these amendments meet the eligibility criteria for categorical exclusion set forth in 10 CFR 651.22(c)(9).
Pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessment need be prepared in connection with the issuance of these amendments.
5.0 CONCLUSION
The staff has concluded, based on the considerations discussed above, that (1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendments will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor:
S. Saba G. Dentel Date: September 23, 1994 l
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